1921] Smiley: Flora of th& Sierra Nevada of California 149 



1. Salix tenera Anderss., in DC. Prodr., vol. 16, pt. 2, p. 288. 



1868. 



S. artica Pallas var. petraea Anderss., I.e., p. 287. 

 8. Brownii Bebb var. petraea Bebb, Bot. Gaz., vol. 14, p. 115. 1889. 

 S. petrophila Eydb., Bull. N". Y. Bot. Gard., vol. 1, p. 268. 1899. 

 S. caespitosa Kennedy, Muhl., vol. 7, p. 135. 1912. 



Type locality. "In America septentrional!, ad Cascade-mountain, 

 lat. 49, alt. 7000 ped." 



Range. British Columbia and mountains of Alberta south to the 

 southern Sierra Nevada through the Cascades and through the 

 Rockies to New Mexico. 



Zone. Arctic-alpine. 



Specimens examined. Mt. Rose, 10,000 feet, Kennedy 1173 (co- 

 type of S. caespitosa in U. C.) ; Dick's Peak, Tahoe, 10,000 feet, Smiley 

 431 ; Sierra County, Lemmon 208 (without definite locality) ; Mt. 

 Dana, 10-11,000 feet, Brewer 1734; same locality, Congdon, August 

 11, 1898; Mt. Gibbs, Yosemite, 12,200 feet, Smiley 760; Mt. Lyell, 

 10,800-11,000 feet, Hall and Babcock 3584 ; Mt. Goddard, 11,100 feet, 

 Hall and Chandler 685 ; Milestone Plateau near Mt. Whitney, Tulare 

 County, Dudley 2463 ; Mt. Brewer above Bubb's Creek, 12,000 feet, 

 E. B. Copeland, August 7, 1899. 



As is indicated by the above synonymy, I am unable to find any 

 characters by which it is possible to distinguish the recently published 

 segregates from the S. tenera of the northern Cascades and Rockies. 

 This and the next are the only true alpine willows of the Sierra, none 

 of the genuine arctic species reaching our region. 



2. Salix nivalis Hook., Fl. Bor. Am., vol. 2, p. 152. 1839. 



S. reticulata var. nivalis Anderss., in DO. Prodr., vol. 16, pt. 2, p. 301. 1868. 

 S. saximontana Kydb., Bull. N. Y. Bot. Gard., vol. 1, p. 261. 1899. 



Type locality. "Near the summits of the peaks in the Rocky 

 Mountains. ' ' 



Range. British Columbia and Alberta south in the Rockies to 

 northern New Mexico and in the Cascade-Sierra to the central Sierra 

 Nevada(?). 



Zone. Arctic-alpine. 



Specimen examined. Mt. Dana, Theo. Labouchere, July, 1915. 



S. saximontana, described from an alpine willow collected on 

 Grays Peak, Colorado, is an exact synonym for the older S. nivalis. 

 Dr. Rydberg, in a note subjoined to the description, says, "In Mon- 

 tajia it seems to grade into S. nivalis," and, referring to the last named 



